Motor brake



March 17, 1931. A. w. sHoBLoM -1,797,105

` MoToR BRAKE Filed Aug.-v 21, 1928 INVENTOR wn'NEssEs -1 ./WShOZ'Zom.lv( BY 4 l ATTORNEY Patented Mar. 17, 1931 TAE AXEL w. srroBLoivr, orrniLIrsBURG, MONTANA MOTOR BRAKE Application led August 21, 1928.

rlhis invent-ion relates to brakes for trucks or automobiles of anykind, and particularly toa'n impro-ved motor brake, the object being toprovide an attachment for part of the motor soas to utilize the pistonsand cylinders as the braking structure for the automobile.

Another object of the invention is to provide a motorvbrake whereinmeans are provided for shifting the valve rocker arms of the 'engine 'sothat the cams cannot cause the valve to function.

Another object, more specifically, is to provide `an attachment for theengine of automobiles wherein by the operation of a suitable lever nearAthe drivers seat all of the valves or any portion thereof may be causedto only partly function or may be caused to cease functioningcompletely, and thereby convert the engine into a pneumatic brakestructure.

1n the accompanying drawing,-

Figure 1 is a fragmentary view partly in Vsection showing a portion ofan kengine with certain parts of the 'engine applied thereto; 44Figure 2is a sectional view through Figure 1 on the line 2-2;

Figure 3 is a schematic view principally Vin elevation disclosing anembodiment of the invention.

Referring to the accompanying drawing by numerals, 1 indicates an enginewhich may be applied to a truck or other car and connected to the partsthereof in the usual manner. As is well known, the engine is Y connectedto two or more of the wheels of the car for driving purposes. Where thevalves of the -engine are held closed or partly closed and the fuel isturned olf or the spark is turned olf, the engine will act as apneumatic brake for resisting rotation of the wheels with which it isconnected` In the present invention the motor 1 is connected with thewheels of the car in the usual manner and ordinarily the motor functionsin the usual manner. However, when going down a steep grade or a longgrade the grip 2 of the lever 3 is grasped and the catch 4 is releasedfrom the ratchet 5 and then the Serial No. 301,043.

lever 3 is pulled to a desired extent for causing the valve 6 to openless and less.

The device is preferably applied to all of the valves, but in theaccompanying drawing it is shown connected with only one valve. As shownin Figure 1, the valve 6 is urged toward its seat 7 by a spring 8 actingon thecylinder head 9 and on the abutment 10, said abutment beingsecured to the valve stem 11 in any desired manner.

As shown in Figure 1, the rocker arm 14 is provided with an enlargementor foot 13 for acting .on rod 11, whileat the opposite end theenlargement or foot 15 accommodates an adjusting screw 12 provided witha 65 suitable lock nut. .This adjusting screw cc` acts with the top ofthe cam rod 16, whereby a proper adjustment may be. secured while therods 16 and 11, as well as the rocker arm 14 may properly function. rlhecam 19 op- 7G erated by the usual cam shaft 2O acts to raise rod 16 atthe proper time and thereby rock the rocker arm 14 for depressing valve`6 so as to admit an explosive mixture, if this valve is an intakevalve, and to permit exhausting of the cylinder, if the valve should bean exhaust valve. The rocker arm '14 is pivotally supported on the pins21 and 22 carried by the bifurcated end 23 of the sleeve 24. This sleeveis urged upwardly by a strong spring 25 which acts on the bifurcated endy23 and on the top of the cylinder head 9. The rocker arm 14 is providedwith a comparatively large bore 26 and at the upper part adjacent bore26 isA provided with a 85 rounded bearing surface 27 for receiving theplate 28. The plate 28 is provided with a rounded cam face 29 forreceiving the cam 3() preferably formed integral with the arm 31. rlhecam 30 is formed into two operating 90 cam sections 30 and 30 whereby amore uniform pressure and action is secured. Pins 32 and 33 are carriedby the sections 30 and 30, said pins being screwed into a block 34'whichhas a threaded aperture for receiving the threaded end of the rod 36,which rod is screwed into the head 9 at 37. By reason of this structurewhenever the arm 31 is in its raised position, as shown inV F ifrure 1,the action of rod 16 will have no effect 0n 1 the valve 6, andconsequently, this valve will remain closed. By moving the arm 31 to :Lsubstantially horizontal position cam sections and. 30 will depress thecenter of the rocker arm 14 against the action of spring 25 and then theparts are positioned to cause the engine to operate properly. lVhen therocker arm 14 has been thus dcpressed rod 16 will rock arm 14 and causethe valve 6 to be opened, as shown in Figure 3. As shown in this figure,the arm 31 is pivotally connected at the outer end with link 38, whichlink in turn is pivotally connected to one end of the bell crank lever39. lThe end of bell crank lever 39`is connected to the lower end oflever 3 by the link 41, whereby when the lever 3 is shifted, the rockerarm 14 is either forced downwardly or released so as to be raised byspring 25. Ordinarily, lever 3 is in the position shown in Figure 3 androcker arm 14 is forced downwardly to its greatest extent. l/'Vhen theparts are in the position just mentioned the engine is functioning inthe usual manner to propel the vehicle. When it is desired to use theengine as a brake, lever 3 is moved over a short distance to the right,as shown in Figure 3. This will swing arm 31 upwardly a short distance,and consequently valve 6 will remain closed longer than usual. 1f thebraking action is not suiiicient under these conditions, lever 3 ismoved over still further to the right (Figure l/Vhere it is desired tohave the valve 6 remain closed continually, lever 3 is moved over to theright in Figure 3 to its extreme position, whereupon rocker arm 14 willbe completely released, so that the rod 16 cannot move the rocker armfor opening valve 6. As heretofore mentioned, lever 3 could be connectedwith only one of the valves of the engine or with all of the valves orwith any portion of the valves.

lWhat I claim is 1. A motor brake, comprising in combination with aninternal combustion engine having a valve, a rocker arm for opening saidvalve when the rocker arm is moved in one direction, a spring forclosing said valve and moving-the rocker arm in a reverse direction,means for resiliently land rockably supporting said rocker arm, a rodextending loosely through said means, and an arc-shaped cani pivotallymounted on said rod acting Vto releasably hold said rocker arm in anoperative position.

2. In a motor brake, the combination with a motor having a valve and avalve operating rod, of a rocker arm positioned to be moved in onedirection by said rod for opening said valve,` a spring for closing saidvalve and moving the rocker arm in the opposite direction, a resilientsupport for said rocker arm, a bifurcated arc-shaped rockable camnormally holding said support depressed and said rocker arm in anoperative position, an

arm for moving said cam to a position whereb i said resilient supportmay move the rocker arm to an inoperative position.

3. In a motor brake, the combination with an ordinary internalcombustion engine, of a resilient support for each of the rocker arms ofthe engine, a fixed rod extending through said support and the rockerarms, a cam pivotally mounted on the outer end of the rod positioned tomove the rocker arms downwardly so that the mechanism of the engine willcause the same to function properly, and means for shifting saidmechanism so that said rocker arm may move upwardly out of operativeposition.

4. i motor brake, comprising an internal combustion engine provided withthe usual valves and means for operating the valves, said meansincluding a rocker arm having an aperture extending therethroughcentrally, resilient support for said rocker arm, a fixed rod extendingthrough said support and rocker arm, a cam rotatably mounted on theouter end of said rod, said cam being positioned to move said rocker armdownwardly against the action of said resilient support when the cam ismoved to a given position, and to release the rocker arm when the cam ismoved to a second position, whereby said resilient support will movesaid rocker arm to an inoperative position.k

5. ln a motor brake, the combination with an internal combustionengineprovided with the usual valves and other operating attachments includingrocker arms, each of said rocker arms having an aperture extendingtherethrough, a stationary rod extending through said aperture, asupport surrounding said rod and supporting said rocker arm, saidsupport including a spring and a pivotally mounted cam connected withsaid rod and acting on said rocker arm, said spring acting to hold therocker arm in an inoperative position and said cam functioning to movethe rocker arm to an operating position when the cam has been moved to agiven position.

6. In a motor brake, the combination with an internal combustion enginehaving the usual valves and other attachments, of a speciallyconstructed rocker arm for operating the valves, said rocker arm havingan aperture passing therethrough centrally and a bearing surfacepositioned in the aperture, a resilient support for the rocker arm, saidsupport including a forked member, a pair of pins carried by said forkedmember loosely extending into said rocker arm for pivotally supportingthe rocker arm, a stationary rod, extending through said support and theaperture in the rocker arm, and a cam for moving the rocker armdownwardly against the action of said spring.

7. In a motor brake, the combination with an internal combustion engineprovided with the usual valves and other operating attachments, saidengine being provided With a specially formed rocker arm for each Valve,each of said rocker arms having openings therein near the center, pinsextending from said openings, and a bifurcated support carrying' saidpins and straddling said rocker arm, a spring for resiliently supportingsaid support, and means including a cam for depressing said rocker armagainst the action of said spring7 said rocker arm When depressed beingpositioned to function in the usual manner of rocker arms and whenreleased by said cam being raised so as not to function.

AXEL W. SHOBLOM.

